Put cold flannels on the bumped bits, and then check her for any other painful bits, run your hands up and down her limbs, ribs etc.
Is it concussion if the pupils are dilated, or small? can't remember. BUT I think, as others have said, the advice in the Gt Ormond st book is if they did not lose consciousness, and are not drowsy, floppy or sick, they are o.K.
POOR little girl, and you.